2000 Pontiac Grand Prix GT Running Head Lights and Blower wiring

I am trying to isolate the culprit as to why my blower randomely works. When my blower does not work, I have found that my A/C, Rear Defroster, and
my Day-Time Running lights do not work. If I turn the blower switch to the OFF position, my running lights come on. Does anyone know of a tie-in to these two or where I can get a wiring schemetic so I can trace it down?
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You can obtain a factory service manual on eBay or from www.helminc.com

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